Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-01-03
1995-02-28
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 40, 359 72, G02F 11335, G02F 1135
Patent
active
053942540
ABSTRACT:
A liquid crystal light valve projector assembly is disclosed here including (1) a multi dashed layered liquid crystal light valve having a light-writing side and a light projecting side, (2) light-writing means for producing modulated writing light representative of a given image, which writing light when written onto the light-writing side of said light valve causes the latter to modulate in a corresponding manner, and (3) light projecting means cooperating with the light-projecting side of said light valve for projecting a correspondingly modulated projection light beam onto a projection plane for visually displaying the given image. In addition to the components just recited, the liquid crystal light valve projector assembly disclosed here in also includes the fiber optic plate arrangement which is provided for coupling the light-writing means, for example a cathode ray tube, to the light valve and which is specifically designed to eliminate from the ultimately projected image the faint honeycomb pattern known as the "chicken wire effect". This is accomplished by polishing the fiber optic plate surfaces into smooth surfaces in which the reflectance at the outer perimeter of optical fiber bundles within each surface is less than twice the reflectance at any other position within a corresponding optical fiber bundle.
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Bleha, "Application of the Liquid Crystal Light Valve to Read-Time Optical Data Processing", Optical Engineering, vol. 17, No. 4 (Jul.-Aug. 1978), pp. 371-384.
Gates, "Direct Coupled CRT Liquid Crystal Display", XEROX Disclosure Journal, vol. 1, No. 6 (Jun. 1976), pp. 77-78.
Ledebuhr, Arno G., "Full-Color Single-Projection-Lens Liquid Crystal Light-Valve Projector", SID86 Digest (1986), pp. 379-382.
Greyhawk Systems, Inc.
Gross Anita Pellman
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